Signal processing method and transmitter

1. A method, wherein the method is applied to an orthogonal frequency division multiplexing (OFDM) wireless transmission system comprising at least two OFDM symbols, the method comprising: dividing, by a transmitter, a first OFDM symbol of the at least two OFDM symbols into F parts, wherein F≥2; adding, by the transmitter, a zero power padding (ZP) to a tail end of each of the at least two OFDM symbols by: adding, by the transmitter, the ZP to a tail end of divided data of each part obtained after dividing the first OFDM symbol of the at least two OFDM symbols; adding, by the transmitter, data of N w consecutive points at one end of the first OFDM symbol of the at least two OFDM symbols to the ZP at the other end of the first OFDM symbol, so that the data of the N w points is used as at least one of a prefix or a suffix of the first OFDM symbol, wherein the first OFDM symbol comprises data of N points, and N>N w ; and performing, by the transmitter, point multiplication processing with a symmetric time domain window function on the data of the N w points at the two ends of the first OFDM symbol to which at least one of the prefix or the suffix is added, so that a sum of point coefficients corresponding to the symmetric time domain window function is 1.

2. The method of claim 1 , wherein the adding, by the transmitter, data of N w consecutive points comprises: adding, by the transmitter, data of N w f consecutive points at a head end of divided data of a part f+1 obtained after dividing the first OFDM symbol of the at least two OFDM symbols to a start location in a ZP at a tail end of divided data of a part f, so that the data of the N w f points is used as a suffix of the divided data of the part f; and adding data of N w F−1 consecutive points at a head end of divided data of a part 0 to a start location in a ZP at a tail end of divided data of a part F−1, so that the data of the N w F−1 points is used as a suffix of the divided data of the part F−1, wherein 0≤f<F; and the performing, by the transmitter, point multiplication processing with a symmetric time domain window function on the data of the N w points comprises: performing, by the transmitter, point multiplication processing with the symmetric time domain window function on the data of the N w f consecutive points at the head end of the divided data of the part f+1 and the data of the N w f points in the suffix at the tail end of the divided data of the part f, so that the sum of the point coefficients corresponding to the symmetric window function is 1; and performing point multiplication processing with the symmetric time domain window function on the data of the N w F−1 consecutive points at the head end of the divided data of the part 0 and the data of the N w F−1 points in the suffix at the tail end of the divided data of the part F−1, so that the sum of the point coefficients corresponding to the symmetric window function is 1.

3. The method of claim 1 , wherein the adding, by the transmitter, data of N w consecutive points comprises: adding, by the transmitter, data of N w f consecutive points at a tail end of divided data of a part f obtained after dividing the first OFDM symbol of the at least two OFDM symbols to an end location in the ZP at the tail end of the divided data of the part f, so that the data of the N w f points is used as a prefix of divided data of a part f+1; and adding data of continuous N w F−1 points at a head end of divided data of a part 0 to a start location in the ZP at a tail end of divided data of a part F−1, so that the data of the N w F−1 points is used as a suffix of the divided data of the part F−1, wherein 0≤f<F; and the performing, by the transmitter, point multiplication processing with a symmetric time domain window function on the data of the N w points comprises: performing, by the transmitter, point multiplication processing with the symmetric time domain window function on the data of the continuous N w f points at the tail end of the divided data of the part f and the data of the N w f points in the prefix at the head end of the divided data of the part f+1, so that the sum of the point coefficients corresponding to the symmetric window function is 1; and performing point multiplication processing with the symmetric time domain window function on the data of the N w F−1 consecutive points at the head end of the divided data of the part 0 and the data of the N w F−1 points in the suffix at the tail end of the divided data of the part F−1, so that the sum of the point coefficients corresponding to the symmetric window function is 1.

4. The method of claim 3 , wherein the adding, by the transmitter, data of N w consecutive points 1 comprises: adding, by the transmitter, data of N w f consecutive points at a head end of divided data of a part f+1 obtained after dividing the first OFDM symbol of the at least two OFDM symbols to a start location in a ZP at a tail end of divided data of a part f, so that the data of the N w f points is used as a suffix of the divided data of the part f; and adding data of N w F−1 consecutive points at a tail end of divided data of a part F−1 to an end location in a ZP at a tail end of previous neighboring divided data or a ZP at a tail end of a previous OFDM symbol at a head end of divided data of a part 0 , so that the data of the N w F−1 points is used as a prefix of the divided data of the part 0 , wherein 0≤f<F; and the performing, by the transmitter, point multiplication processing with a symmetric time domain window function on the data of the N w points comprises: performing, by the transmitter, point multiplication processing with the symmetric time domain window function on the data of the N w f consecutive points at the head end of the divided data of the part f+1 and the data of the N w f points in the suffix at the tail end of the divided data of the part f, so that the sum of the point coefficients corresponding to the symmetric window function is 1; and performing point multiplication processing with the symmetric time domain window function on the data of the N w F−1 points in the prefix at the head end of the divided data of the part 0 and the data of the N w F−1 consecutive points at the tail end of the divided data of the part F−1, so that the sum of the point coefficients corresponding to the symmetric window function is 1.

5. The method of claim 1 , wherein the adding, by the transmitter, data of N w consecutive points comprises: adding, by the transmitter, data of N w f consecutive points at a tail end of divided data of a part f obtained after dividing the first OFDM symbol of the at least two OFDM symbols to an end location in a ZP at the tail end of the divided data of the part f, so that the data of the N w f points is used as a prefix of divided data of a part f+1; and adding data of N w F−1 consecutive points at a tail end of divided data of a part F−1 to an end location in a ZP at a tail end of previous neighboring divided data or a ZP at a tail end of a previous OFDM symbol at a head end of divided data of a part 0 , so that the data of the N w F−1 points is used as a prefix of the divided data of the part 0 , wherein 0≤f<F; and the performing, by the transmitter, point multiplication processing with a symmetric time domain window function on the data of the N w points comprises: performing, by the transmitter, point multiplication processing with the symmetric time domain window function on the data of the continuous N w f points at the tail end of the divided data of the part f and the data of the N w f points in the prefix at the head end of the divided data of the part f+1, so that the sum of the point coefficients corresponding to the symmetric window function is 1; and performing point multiplication processing with the symmetric time domain window function on the data of the N w F−1 points in the prefix at the head end of the divided data of the part 0 and the data of the N w F−1 consecutive points at the tail end of the divided data of the part F−1, so that the sum of the point coefficients corresponding to the symmetric window function is 1.

6. The method of claim 1 , wherein the adding, by the transmitter, data of N w consecutive points comprises: adding, by the transmitter, data of N w f consecutive points at a head end of divided data of a part f+1 obtained after dividing the first OFDM symbol of the at least two OFDM symbols to a start location in a ZP at a tail end of divided data of a part f, so that the data of the N w f points is used as a suffix of the divided data of the part f; adding data of N w F−1 consecutive points at a head end of divided data of a part 0 to a start location in a ZP at a tail end of divided data of a part F−1, so that the data of the N w F−1 points is used as a suffix of the divided data of the part F−1; and adding data of N w F−1 consecutive points at the tail end of the divided data of the part F−1 to an end location in a ZP at a tail end of previous neighboring divided data or a ZP at a tail end of a previous OFDM symbol at the head end of the divided data of the part 0 , so that the data of the N w F−1 points is used as a prefix of the divided data of the part 0 , wherein 0≤f<F; and the performing, by the transmitter, point multiplication processing with a symmetric time domain window function on the data of the N w points comprises: performing, by the transmitter, point multiplication processing with the symmetric time domain window function on the data of the N w f consecutive points at the head end of the divided data of the part f+1 and the data of the N w f points in the suffix at the tail end of the divided data of the part f, so that the sum of the point coefficients corresponding to the symmetric window function is 1; performing point multiplication processing with the symmetric time domain window function on the data of the N w F−1 consecutive points at the head end of the divided data of the part 0 and the data of the N w F−1 points in the suffix at the tail end of the divided data of the part F−1, so that the sum of the point coefficients corresponding to the symmetric window function is 1; and performing point multiplication processing with the symmetric time domain window function on the data of the N w F−1 points in the prefix at the head end of the divided data of the part 0 and the data of the N w F−1 consecutive points at the tail end of the divided data of the part F−1, so that the sum of the point coefficients corresponding to the symmetric window function is 1.

7. The method of claim 1 , wherein the adding, by the transmitter, data of N w consecutive points comprises: adding, by the transmitter, data of N w f consecutive points at a tail end of divided data of a part f obtained after dividing the first OFDM symbol of the at least two OFDM symbols to an end location in a ZP at the tail end of the divided data of the part f, so that the data of the N w f points is used as a prefix of divided data of a part f+1; adding data of a continuous N w F−1 points at a head end of divided data of a part 0 to a start location in a ZP at a tail end of divided data of a part F−1, so that the data of the N w F−1 points is used as a suffix of the divided data of the part F−1; and adding data of N w F−1 consecutive points at the tail end of the divided data of the part F−1 to an end location in a ZP at a tail end of previous neighboring divided data or a ZP at a tail end of a previous OFDM symbol at the head end of the divided data of the part 0 , so that the data of the N w F−1 points is used as a prefix of the divided data of the part 0 , wherein 0≤f<F; and the performing, by the transmitter, point multiplication processing with a symmetric time domain window function on the data of the N w points comprises: performing, by the transmitter, point multiplication processing with the symmetric time domain window function on the data of the continuous N w f points at the tail end of the divided data of the part f and the data of the N w f points in the prefix at the head end of the divided data of the part f+1, so that the sum of the point coefficients corresponding to the symmetric window function is 1; performing point multiplication processing with the symmetric time domain window function on the data of the N w F−1 consecutive points at the head end of the divided data of the part 0 and the data of the N w F−1 points in the suffix at the tail end of the divided data of the part F−1, so that the sum of the point coefficients corresponding to the symmetric window function is 1; and performing point multiplication processing with the symmetric time domain window function on the data of the N w F−1 points in the prefix at the head end of the divided data of the part 0 and the data of the N w F−1 consecutive points at the tail end of the divided data of the part F−1, so that the sum of the point coefficients corresponding to the symmetric window function is 1.

8. A transmitter, applied to an OFDM wireless transmission system comprising at least two OFDM symbols, the transmitter comprising: a processor, a memory, and a bus, the processor is connected to the memory by using the bus, the memory is configured to store program code, and the processor is configured to execute the program code to: divide, a first OFDM symbol of at least two OFDM symbols into F parts, wherein F≥2; add a zero power padding ZP to a tail end of each of the at least two OFDM symbols by: adding the ZP to a tail end of divided data of each part obtained after dividing the first OFDM symbol of the at least two OFDM symbols; add data of N w consecutive points at one end of the first OFDM symbol of the at least two OFDM symbols to the ZP at the other end of the first OFDM symbol, so that the data of the N w points is used as at least one of a prefix or a suffix of the first OFDM symbol, wherein the first OFDM symbol comprises data of N points, and N>N w ; and perform point multiplication processing with a symmetric time domain window function on the data of the N w points at the two ends of the first OFDM symbol to which at least one of the prefix or the suffix is added, so that a sum of point coefficients corresponding to the symmetric time domain window function is 1.

9. The transmitter of claim 8 , wherein the processor is configured to execute the program code to: add data of N w f consecutive points at a head end of divided data of a part f+1 obtained after dividing the first OFDM symbol of the at least two OFDM symbols to a start location in a ZP at a tail end of divided data of a part f, so that the data of the N w f points is used as a suffix of the divided data of the part f; and add data of N w F−1 consecutive points at a head end of divided data of a part 0 to a start location in a ZP at a tail end of divided data of a part F−1, so that the data of the N w F−1 points is used as a suffix of the divided data of the part F−1, wherein 0≤f<F; and perform point multiplication processing with the symmetric time domain window function on the data of the N w f consecutive points at the head end of the divided data of the part f+1 and the data of the N w f points in the suffix at the tail end of the divided data of the part f, so that the sum of the point coefficients corresponding to the symmetric window function is 1; and perform point multiplication processing with the symmetric time domain window function on the data of the N w F−1 consecutive points at the head end of the divided data of the part 0 and the data of the N w F−1 points in the suffix at the tail end of the divided data of the part F−1, so that the sum of the point coefficients corresponding to the symmetric window function is 1.

10. The transmitter of claim 8 , wherein the processor is configured to execute the program code to: add data of N w f consecutive points at a tail end of divided data of a part f obtained after dividing the first OFDM symbol of the at least two OFDM symbols to an end location in the ZP at the tail end of the divided data of the part f, so that the data of the N w f points is used as a prefix of divided data of a part f+1; and add data of a continuous N w F−1 points at a head end of divided data of a part 0 to a start location in the ZP at a tail end of divided data of a part F−1, so that the data of the N w F−1 points is used as a suffix of the divided data of the part F−1, wherein 0≤f<F; and perform point multiplication processing with the symmetric time domain window function on the data of the continuous N w f points at the tail end of the divided data of the part f and the data of the N w f points in the prefix at the head end of the divided data of the part f+1, so that the sum of the point coefficients corresponding to the symmetric window function is 1; and perform point multiplication processing with the symmetric time domain window function on the data of the N w F−1 consecutive points at the head end of the divided data of the part 0 and the data of the N w F−1 points in the suffix at the tail end of the divided data of the part F−1, so that the sum of the point coefficients corresponding to the symmetric window function is 1.

11. The transmitter of claim 8 , wherein the processor is configured to execute the program code to: add data of N w f consecutive points at a head end of divided data of a part f+1 obtained after dividing the first OFDM symbol of the at least two OFDM symbols to a start location in a ZP at a tail end of divided data of a part f, so that the data of the N w f points is used as a suffix of the divided data of the part f; and add data of N w F−1 consecutive points at a tail end of divided data of a part F−1 to an end location in a ZP at a tail end of previous neighboring divided data or a ZP at a tail end of a previous OFDM symbol at a head end of divided data of a part 0 , so that the data of the N w F−1 points is used as a prefix of the divided data of the part 0 , wherein 0≤f<F; and perform point multiplication processing with the symmetric time domain window function on the data of the N w f consecutive points at the head end of the divided data of the part f+1 and the N w f data of the points in the suffix at the tail end of the divided data of the part f, so that the sum of the point coefficients corresponding to the symmetric window function is 1; and perform point multiplication processing with the symmetric time domain window function on the data of the N w F−1 points in the prefix at the head end of the divided data of the part 0 and the data of the N w F−1 consecutive points at the tail end of the divided data of the part F−1, so that the sum of the point coefficients corresponding to the symmetric window function is 1.

12. The transmitter of claim 8 , wherein the processor is configured to execute the program code to: add data of N w f consecutive points at a tail end of divided data of a part f obtained after dividing the first OFDM symbol of the at least two OFDM symbols to an end location in a ZP at the tail end of the divided data of the part f, so that the data of the N w f points is used as a prefix of divided data of a part f+1; and add data of N w F−1 consecutive points at a tail end of divided data of a part F−1 to an end location in a ZP at a tail end of previous neighboring divided data or a ZP at a tail end of a previous OFDM symbol at a head end of divided data of a part 0 , so that the data of the N w F−1 points is used as a prefix of the divided data of the part 0 , wherein 0≤f<F; and perform point multiplication processing with the symmetric time domain window function on the data of the continuous N w f points at the tail end of the divided data of the part f and the data of the N w f points in the prefix at the head end of the divided data of the part f+1, so that the sum of the point coefficients corresponding to the symmetric window function is 1; and perform point multiplication processing with the symmetric time domain window function on the data of the N w F−1 points in the prefix at the head end of the divided data of the part 0 and the data of the N w F−1 consecutive points at the tail end of the divided data of the part F−1, so that the sum of the point coefficients corresponding to the symmetric window function is 1.